VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
2.48832Gb/s 16:1 SONET/SDH
Transceiver with Integrated Clock Generator
VSC8140
Table 5: Package Pin Identification - 208 BGA
Pin #
Name
I/O
Level
Description
B3
D4
C3
C1
F4
F3
D1
E1
G4
G3
F2
G2
F1
H3
H2
G1
H1
J2
VCC
VCC
—
—
—
I
3.3V typ. Positive power supply
3.3V typ. Positive power supply
GND typ. Negative power supply
VEE
FACLOOP
LOOPTIM0
PARMODE
FIFORESET
LOOPTIM1
REF_FREQSEL
VEE
TTL
TTL
TTL
TTL
TTL
TTL
Facility loopback, active high
I
Enable internal looptiming operation, active high
Parity mode select
I
I
Reset to align FIFO write and read pointers
Enable external loop timing operation, active high
Reference clock input select
I
I
—
I
GND typ. Negative power supply
LPTIMCLK+
LPTIMCLK-
VCC_ANA
VEE_ANA
REFCLK+
REFCLK-
VEE
LVPECL External loop timing clock, true
LVPECL External loop timing clock, complement
+3.3V typ. Positive power supplies for analog parts of CMU
GND typ. Negative power supplies for analog parts of CMU
LVPECL Reference clock input, true
I
—
—
I
I
LVPECL Reference clock input,complement
GND typ. Negative power supply
—
—
—
—
—
—
—
VCC
3.3V typ. Positive power supply
J4
FILTAO
—
—
—
—
Loop filter pin - connect via capacitor to FILTAI (pin 53)
Loop filter pin - connect via capacitor to FILTAIN (pin 54)
Loop filter pin - connect via capacitor to FILTAO (pin 51)
Loop filter pin - connect via capacitor to FILTAON (pin 52)
J3
FILTAON
FILTAI
K1
K2
K3
FILTAIN
VCC
3.3V typ. Positive power supply
Low-speed clock output, true. A divide-by-16 version of the PLL
clock.
K4
L1
TXCLK16O+
TXCLK16O-
O
O
LVPECL
LVPECL
Low-speed clock output, complement. A divide-by-16 version of the
PLL clock.
M1
L2
VEE
TXCLK16I-
TXCLK16I+
VCC
—
I
GND typ. Negative power supply
LVPECL Low-speed clock input for latching low-speed data, complement
LVPECL Low-speed clock input for latching low-speed data, true
3.3V typ. Positive power supply
L3
I
L4
—
I
M2
M3
M4
P1
TXPARITYIN
TXIN15
LVPECL Transmitter parity bit input
LVPECL Low-speed single-ended data (MSB)(1)
I
TXIN14
I
LVPECL Low-speed single-ended data
VEE
—
GND typ. Negative power supply
G52251-0, Rev. 4.0
9/6/00
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 25
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